<template>
	<view 
	class="mescroll-body mescroll-render-touch" 
	:class="{'mescorll-sticky': sticky}"
	:style="{'minHeight':minHeight, 'padding-top': padTop, 'padding-bottom': padBottom}" 
	@touchstart="wxsBiz.touchstartEvent" 
	@touchmove="wxsBiz.touchmoveEvent" 
	@touchend="wxsBiz.touchendEvent" 
	@touchcancel="wxsBiz.touchendEvent"
	:change:prop="wxsBiz.propObserver"
	:prop="wxsProp"
	>
		<!-- 状态栏 -->
		<view v-if="topbar&&statusBarHeight" class="mescroll-topbar" :style="{height: statusBarHeight+'px', background: topbar}"></view>
		
		<view class="mescroll-body-content mescroll-wxs-content" :style="{ transform: translateY, transition: transition }" :change:prop="wxsBiz.callObserver" :prop="callProp">
			<!-- 下拉加载区域 (支付宝小程序子组件传参给子子组件仍报单项数据流的异常,暂时不通过mescroll-down组件实现)-->
			<!-- <mescroll-down :option="mescroll.optDown" :type="downLoadType" :rate="downRate"></mescroll-down> -->
			<view v-if="mescroll.optDown.use" class="mescroll-downwarp" :style="{'background':mescroll.optDown.bgColor,'color':mescroll.optDown.textColor}">
				<view class="downwarp-content">
					<view class="downwarp-progress mescroll-wxs-progress" :class="{'mescroll-rotate': isDownLoading}" :style="{'border-color':mescroll.optDown.textColor, 'transform': downRotate}"></view>
					<view class="downwarp-tip">{{downText}}</view>
				</view>
			</view>
	
			<!-- 列表内容 -->
			<slot></slot>

			<!-- 空布局 -->
			<mescroll-empty v-if="isShowEmpty" :option="mescroll.optUp.empty" @emptyclick="emptyClick"></mescroll-empty>
			<!-- <blank-card v-if="isShowEmpty" :hintText="mescroll.optUp.empty.tip" :describe="mescroll.optUp.empty.describe" :height="mescroll.optUp.empty.height"></blank-card> -->
			<!-- 上拉加载区域 (下拉刷新时不显示, 支付宝小程序子组件传参给子子组件仍报单项数据流的异常,暂时不通过mescroll-up组件实现)-->
			<!-- <mescroll-up v-if="mescroll.optUp.use && !isDownLoading && upLoadType!==3" :option="mescroll.optUp" :type="upLoadType"></mescroll-up> -->
			<view v-if="mescroll.optUp.use && !isDownLoading && upLoadType!==3" class="mescroll-upwarp" :style="{'background':mescroll.optUp.bgColor,'color':mescroll.optUp.textColor}">
				<!-- 加载中 (此处不能用v-if,否则android小程序快速上拉可能会不断触发上拉回调) -->
				<view v-show="upLoadType===1">
					<view class="upwarp-progress mescroll-rotate" :style="{'border-color':mescroll.optUp.textColor}"></view>
					<view class="upwarp-tip">{{ mescroll.optUp.textLoading }}</view>
				</view>
				<!-- 无数据 -->
				<view v-if="upLoadType===2" class="upwarp-nodata">{{ mescroll.optUp.textNoMore }}</view>
			</view>
		</view>
		
		<!-- 底部是否偏移TabBar的高度(默认仅在H5端的tab页生效) -->
		<!-- #ifdef H5 -->
		<view v-if="bottombar && windowBottom>0" class="mescroll-bottombar" :style="{height: windowBottom+'px'}"></view>
		<!-- #endif -->
		
		<!-- 适配iPhoneX -->
		<view v-if="safearea" class="mescroll-safearea"></view>
		
		<!-- 回到顶部按钮 (fixed元素需写在transform外面,防止降级为absolute)-->
		<mescroll-top v-model="isShowToTop" :option="mescroll.optUp.toTop" @click="toTopClick"></mescroll-top>
		
		<!-- #ifdef MP-WEIXIN || MP-QQ || APP-PLUS || H5 -->
		<!-- renderjs的数据载体,不可写在mescroll-downwarp内部,避免use为false时,载体丢失,无法更新数据 -->
		<!-- <view :change:prop="renderBiz.propObserver" :prop="wxsProp"></view> -->
		<!-- #endif -->
	</view>
</template>

<!-- 微信小程序, QQ小程序, app, h5使用wxs -->
<!-- #ifdef MP-WEIXIN || MP-QQ || APP-PLUS || H5 -->
<script src="../mescroll-uni/wxs/wxs.wxs" module="wxsBiz" lang="wxs"></script>
<!-- #endif -->

<!-- app, h5使用renderjs -->
<!-- #ifdef APP-PLUS || H5 -->
<!-- <script module="renderBiz" lang="renderjs">
	import renderBiz from "../mescroll-uni/wxs/renderjs.js";
	export default {
		mixins: [renderBiz]
	}
</script> -->
<!-- #endif -->

<script>
	
	import MeScroll from "../mescroll-uni/mescroll-uni.js";
	
	import GlobalOption from "../mescroll-uni/mescroll-uni-option.js";
	
	import mescrollI18n from '../mescroll-uni/mescroll-i18n.js';
	
	import MescrollTop from "../mescroll-uni/components/mescroll-top.vue";
	
	import WxsMixin from "../mescroll-uni/wxs/mixins.js";
	
	
	export default {
		name: 'mescroll-body',
		mixins: [WxsMixin],
		components: {
			MescrollTop
		},
		props: {
			down: Object,
			up: Object,
			i18n: Object,
			top: [String, Number],
			topbar: [Boolean, String],
			bottom: [String, Number],
			safearea: Boolean,
			height: [String, Number],
			bottombar:{
				type: Boolean,
				default: true
			},
			sticky: Boolean
		},
		data() {
			return {
				mescroll: {optDown:{},optUp:{}}, 
				downHight: 0, 
				downRate: 0, 
				downLoadType: 0, 
				upLoadType: 0, 
				isShowEmpty: false, 
				isShowToTop: false, 
				windowHeight: 0, 
				windowBottom: 0, 
				statusBarHeight: 0 
			};
		},
		computed: {
			
			minHeight(){
				return this.toPx(this.height || '100%') + 'px'
			},
			
			numTop() {
				return this.toPx(this.top)
			},
			padTop() {
				return this.numTop + 'px';
			},
			
			numBottom() {
				return this.toPx(this.bottom);
			},
			padBottom() {
				return this.numBottom + 'px';
			},
			
			isDownReset() {
				return this.downLoadType === 3 || this.downLoadType === 4;
			},
			
			transition() {
				return this.isDownReset ? 'transform 300ms' : '';
			},
			translateY() {
				return this.downHight > 0 ? 'translateY(' + this.downHight + 'px)' : ''; 
			},
			
			isDownLoading(){
				return this.downLoadType === 3
			},
			
			downRotate(){
				return 'rotate(' + 360 * this.downRate + 'deg)'
			},
			
			downText(){
				if(!this.mescroll) return ""; 
				switch (this.downLoadType){
					case 1: return this.mescroll.optDown.textInOffset;
					case 2: return this.mescroll.optDown.textOutOffset;
					case 3: return this.mescroll.optDown.textLoading;
					case 4: return this.mescroll.isDownEndSuccess ? this.mescroll.optDown.textSuccess : this.mescroll.isDownEndSuccess==false ? this.mescroll.optDown.textErr : this.mescroll.optDown.textInOffset;
					default: return this.mescroll.optDown.textInOffset;
				}
			}
		},
		methods: {
			
			toPx(num) {
				if (typeof num === 'string') {
					if (num.indexOf('px') !== -1) {
						if (num.indexOf('rpx') !== -1) {
							
							num = num.replace('rpx', '');
						} else if (num.indexOf('upx') !== -1) {
							
							num = num.replace('upx', '');
						} else {
							
							return Number(num.replace('px', ''));
						}
					} else if (num.indexOf('%') !== -1) {
						
						let rate = Number(num.replace('%', '')) / 100;
						return this.windowHeight * rate;
					}
				}
				return num ? uni.upx2px(Number(num)) : 0;
			},
			
			emptyClick() {
				this.$emit('emptyclick', this.mescroll);
			},
			
			toTopClick() {
				this.mescroll.scrollTo(0, this.mescroll.optUp.toTop.duration); 
				this.$emit('topclick', this.mescroll); 
			}
		},
		
		created() {
			let vm = this;

			let diyOption = {
				
				down: {
					inOffset() {
						vm.downLoadType = 1; 
					},
					outOffset() {
						vm.downLoadType = 2; 
					},
					onMoving(mescroll, rate, downHight) {
						
						vm.downHight = downHight; 
						vm.downRate = rate; 
					},
					showLoading(mescroll, downHight) {
						vm.downLoadType = 3; 
						vm.downHight = downHight; 
					},
					beforeEndDownScroll(mescroll){
						vm.downLoadType = 4; 
						return mescroll.optDown.beforeEndDelay 
					},
					endDownScroll() {
						vm.downLoadType = 4; 
						vm.downHight = 0; 
						if(vm.downResetTimer) {clearTimeout(vm.downResetTimer); vm.downResetTimer = null} 
						vm.downResetTimer = setTimeout(()=>{ 
							if(vm.downLoadType === 4) vm.downLoadType = 0
						},300)
					},
					
					callback: function(mescroll) {
						vm.$emit('down', mescroll);
					}
				},
				
				up: {
					
					showLoading() {
						vm.upLoadType = 1;
					},
					
					showNoMore() {
						vm.upLoadType = 2;
					},
					
					hideUpScroll(mescroll) {
						vm.upLoadType = mescroll.optUp.hasNext ? 0 : 3;
					},
					
					empty: {
						onShow(isShow) {
							
							vm.isShowEmpty = isShow;
						}
					},
					
					toTop: {
						onShow(isShow) {
							
							vm.isShowToTop = isShow;
						}
					},
					
					callback: function(mescroll) {
						vm.$emit('up', mescroll);
					}
				}
			};
			
			let i18nType = mescrollI18n.getType() 
			let i18nOption = {type: i18nType} 
			MeScroll.extend(i18nOption, vm.i18n) 
			MeScroll.extend(i18nOption, GlobalOption.i18n) 
			MeScroll.extend(diyOption, i18nOption[i18nType]); 
			MeScroll.extend(diyOption, {down:GlobalOption.down, up:GlobalOption.up}); 
			let myOption = JSON.parse(JSON.stringify({down: vm.down,up: vm.up})); 
			MeScroll.extend(myOption, diyOption); 

			
			vm.mescroll = new MeScroll(myOption, true); 
			
			vm.mescroll.i18n = i18nOption;
			
			vm.$emit('init', vm.mescroll);

			
			const sys = uni.getSystemInfoSync();
			if (sys.windowHeight) vm.windowHeight = sys.windowHeight;
			if (sys.windowBottom) vm.windowBottom = sys.windowBottom;
			if (sys.statusBarHeight) vm.statusBarHeight = sys.statusBarHeight;
			
			vm.mescroll.setBodyHeight(sys.windowHeight);

			
			vm.mescroll.resetScrollTo((y, t) => {
				if(typeof y === 'string'){
					
					setTimeout(()=>{ 
						let selector;
						if(y.indexOf('#')==-1 && y.indexOf('.')==-1){
							selector = '#'+y 
						}else{
							selector = y
							// #ifdef APP-PLUS || H5 || MP-ALIPAY || MP-DINGTALK
							if(y.indexOf('>>>')!=-1){ 
								selector = y.split('>>>')[1].trim()
							}
							// #endif
						}
						uni.createSelectorQuery().select(selector).boundingClientRect(function(rect){
							if (rect) {
								let top = rect.top
								top += vm.mescroll.getScrollTop()
								uni.pageScrollTo({
									scrollTop: top,
									duration: t
								})
							} else{
								console.error(selector + ' does not exist');
							}
						}).exec()
					},30)
				} else{
					
					uni.pageScrollTo({
						scrollTop: y,
						duration: t
					})
				}
			});

			
			if (vm.up && vm.up.toTop && vm.up.toTop.safearea != null) {} else {
				vm.mescroll.optUp.toTop.safearea = vm.safearea;
			}
			
			
			uni.$on("setMescrollGlobalOption", options=>{
				if(!options) return;
				let i18nType = options.i18n ? options.i18n.type : null
				if(i18nType && vm.mescroll.i18n.type != i18nType){
					vm.mescroll.i18n.type = i18nType
					mescrollI18n.setType(i18nType)
					MeScroll.extend(options, vm.mescroll.i18n[i18nType])
				}
				if(options.down){
					let down = MeScroll.extend({}, options.down)
					vm.mescroll.optDown = MeScroll.extend(down, vm.mescroll.optDown)
				}
				if(options.up){
					let up = MeScroll.extend({}, options.up)
					vm.mescroll.optUp = MeScroll.extend(up, vm.mescroll.optUp)
				}
			})
		},
		destroyed() {
			
			uni.$off("setMescrollGlobalOption")
		}
	};
</script>

<style>
	@import "../mescroll-body/mescroll-body.css";
	@import "../mescroll-uni/components/mescroll-down.css";
	@import "../mescroll-uni/components/mescroll-up.css";
</style>